No, Hooker didn't lose the Heisman Trophy. He was never in possession of it. Now, he does win it and misplaces it, and is unable to relocate it, he will have lost it.
As of 7 hours ago his odds are +160 ahead of Stroud who is +180. Thankfully his performance wasn't outdone by Stroud by much. Does Hooker still win it? Probably not because of all the bias against Tennessee....